Does it come with a power supply?

No. It is a 24V DC strip, so you need a separate 24V driver rated for the strip's wattage. Check the total wattage of your run and add headroom before choosing one.

Is it really dot-free?

Yes. The COB design uses a dense continuous array of chips, so the light reads as one even line rather than individual dots. That is the main reason to pick it over standard SMD strip.

Can I cut it to length?

Yes, at the marked cut points. Cut only on those marks, and keep in mind that COB strips have finer cut intervals than many SMD strips, so measure carefully.

Yes, with a dimmer compatible with the 24V driver you use. Dimming quality depends mostly on the driver, so pair it with a dimmable 24V supply.

Where should I use warm white 3000K?

Living rooms, bedrooms, kitchens and anywhere you want a cozy, slightly amber tone. For task lighting or a crisp look, a cooler white would suit better.

How does it compare with standard SMD strip lights?

COB gives a smoother, dot-free line and usually better dimming, while SMD strips are often cheaper and easier to find in kits. Both need a driver at 24V.